Spark-arrester.



K. M. GOLQUHOUN.

SPARK ARRESTER.

APPLIUATION FILED JUNE 12, 1908.

' Patented m 31, 1910.

M m M g E p w w i 2 M mm m M W Q z 5 K. M. UOLQUHOUN.

SPARK ABRESTER. APPLIOATION IIILED Jim 12, 1908. 959,923, Patented May 31, 1910.

' 2 SHEETS-SHEET 2.

I fKM/ rn eras ear SPARK-ARRESTER.

T 0 all whom it may concern:

Be it known that I, KENNETH M. CoL U- HOUN, of Owatonna, Steel county, Minnesota, have invented certain new and useful Improvements in Spark-Arresters, of which the following is a specification.

The object of my invention is to provide a spark arrester which will positively prevent discharge of sparks or burning embers, thereby eliminating all danger of fire around the engine, and at the same time will not in any way interfere with the draft of the furnace.

A further object is to provide a spark arrester of simple durable constructions and one that is easily accessible for the purpose of cleaning or repairs.

Other objects of the invention will appear from the following detailed description.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure 1 is a vertical sectional view of a spark arrester embodying my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a sectional view of a modified construction. Fig. 4 is a side elevation showing another modification. Fig. 5 illustrates a modified form of hood.

In the drawing, 2 represents a pipe section having vertical slots 3 therein and a clamp device 4: by means of which the spark arrester is secured on the top of a furnace or locomotive stack.

5 represents the base or bottom of the ar rester formed of sheet metal and hopper like, its walls being inclined toward a central opening 6 communicating with the top of the pipe section 2. A correspondingly shaped plate 7 is provided for the top of the arrester also having a central opening 8 leading to a discharge pipe 9. The edges of the bottom and top plates 5 and 7 are connected with one another by bars 10, and rings 11 and 12 preferably of angle bar iron, are also secured to the edges of the top and bottom plates between which rings, a filler 13 of suitable wire mesh is inserted, the edges of the wire being riveted to the vertical flanges of the ring. A series of bars 14: are bolted to the top and bottom plates at intervals, and rings 15 and 16 are secured to said bars concentric with the rings 11 and 12 and spaced therefrom, the lower ring 16 Specification of Letters Patent.

Application filed June 12, 1908.

Patented May 31, 1910.

Serial No. 438,029.

being raised above the bottom 5 to form a passage between them, and a wire filler 17 of suitable mesh is secured to the rings 15 and 16. A series of braces 18 have their lower ends bolted to the bottom plate 5 and converge toward one another and have their upper ends secured together within the pipes 9 by a bolt 19. Rings 20 and 21 are secured to the braces 18 and carry a wire filler 22 in the form of the frustum of a cone, the lower end being raised above the bottom plate and preferably above the level of the ring 16 and the upper end of the cone having a discharge opening 23 communicating with the pipe 2 1. The lower edge of this cone is raised a suflicient distance above the bottom of the arrester, so it will not interfere with the draft. This pipe is curved outwardly through the wall of the pipe 9 and has a downwardly turned perforated end 25 projecting through the top 26 of a cylinder that is secured to the rings 11 and 12 and consists preferably of a wire, or perforate upper portion 27, and an iinperforate portion 28 having a bottom 29 hinged at 30 and held in its locked position by a latch 31 and adapted to be pulled open by a connection 32 which extends to a point within convenient reach of the fireman. The perforate upper portion 27 of the cylinder, I prefer to construct of a fine screen so that a circulation will be established through the pipe 24. without retarding the draft of the engine. The perforated end 25 of the pipe 21, is inclosed by the screened portion of the cylinder or cinder can as shown clearly in Figs. 1, 2 and 3.

A cover 30 is provided for the pipe 9 hinged at 31 and having an arm 32 to which an operating wire 33 is attached. The arm preferably extends down beyond the edge of the cover to form a stop therefor.

In operation the sparks and burning embers passing up through the stack of the engine will be extinguished upon coming in contact with the wire screens and those passing through the inner screen and falling down within the space between the screens will upon striking the hopper bottom, be directed into the stack. Those which ascend vertically upon leaving the stack will enter the open lower end of the cone 22 and be guided thereby through the pipe 2 1 to the receiving cylinder. To increase the draft the fireman may raise the cover 30 until such time as the fuel is well ignited when it is closed and the products of combustion compelled to pass through the screens within the arrester. As indicated in Fig. 1, the cover 30 preferably has a wire mesh filling the middle portion of the cover.

In Fig. 3 I have illustrated a modification which consists in providing a cylindrical hood 35 above the stack opening, provided with a conical hood 36 leading to a pipe 37 having branches 58 extending outwardly and downwardly into cylinders similar to those described. This cylindrical hood has a top plate that is imperforate ercept for the central opening therein and the upper portion of the hood is of substantially the same diameter as the opening in the top plate 7. This prevents sparks from passing p through the hood and escaping through the top plate which sometimes happens where the tapered conical form of hood such as is shown in Fig. 1, is used. In the lower portion of each cylinder I prefer to place a can 39 adapted to contain water and having a handle 40 thereon. These cans are adapted to receive the sparks and embers and extinguish them if any are burning upon reaching the cylinder. hen the cans are filled, they may be readily removed and emptied.

in Fig. 4, I have illustrated a curved wind shield 41 secured to loose bands e2 which are free to revolve to allow the shield to be adjusted on the windward side of the arrester and direct the air currents past the top of the stack and increase the draft at that point. Braces 43 are also provided connecting the upright bars 10 with the ring 11.

In Fig. 5, I have illustrated a modified construction which consists in providing a hood 4% having flaring walls from the bottom upwardly and provided with a sheet metal top 45 from which a pipe corresponding to those described leads outwardly and downwardly into the cinder receptacle. The hood is supported within the inner screen in the same manner as described with reference to the hoods shown in Figs. 1 and 3.

I claim as my invention:

1. A spark arrester comprising a bottom plate in the form of an inverted cone having a central opening and means for attachment to a stack, a top conical shaped plate having a central opening and a pipe connection therefor, an outer vertically arranged screen connecting the peripheries of said top and bottom plates, an intermediate screen depending from said top plate and spaced from said outer screen and having its lower edge raised above the surface of said bot tom plate whereby the accumulation of cinders between said screens may slide into the opening in said bottom plate, a cylindrical hood centrally arranged between the openings in said top and bottom plates and raised out of contact with said bottom plate and above the level of the lower portion of said intermediate screen whereby circulation of air will be permitted under said hood and between it and said intermediate screen, the upper portion of said hood being of substantially the same diameter as the opening in said top plate, and a pipe connected with the top of said hood and extending upwardly through the opening in said top plate and outwardly therefrom and depending outside of and near said outer screen, for the purpose specified, and a screen inclosing the outer end of said pipe.

2. A spark arrester, comprising a bottom plate downwardly inclined toward the center and having a central opening with means for attachment to a stack, a top plate also having an opening therein, and a pipe inclosing said opening, an outer screen connecting the peripheries of said top and bottom plates, an intermediate screen depending from said top plate and spaced from said outer screen, the lower edge of said intermediate screen being raised out of contact with said lower plate, a hood inclosed by said intermediate screen and having its lower edge raised out of contact wit-l1 said lower plate the upper portion of said hood being of substantially the same diameter as the opening in said top plate, and a pipe attached to the top of said hood and extend ing upwardly and outwardly through the pipe on said top plate and having a clownwardly turned outer end, and a cinder can supported outside and near said outer screen and into which can the open discharge end of said hood pipe is inserted the upper portion of said can inclosing said pipe being perforated, substantially as described.

3. A spark arrester, comprising top and bottom plates, and screens arranged one within another intermediate thereto, the lower plate having an opening therein in closed by said screens, and means for connection with a boiler stack, a hood located over the opening in said lower plate and raised out of contact with the same, a pipe connected with said hood and extending upwardly and outwardly through said top plate and provided with a downwardly turned end having a series of perforations tierein, and a cinder can, supported by said plates and having a perforated upper portion into which the perforated end of said pipe is inserted, substantially as described.

4-. A spark arrester, comprising a top and bottom plate, said top plate having a discharge opening, and said bottom plate having an opening therein, and means for attachment to a stack, a hood located over the opening in said lower plate and raised out of contact with said plate screens arranged one within another and secured to said plates and inclosing said hood, a cinder can arranged outside of said screens and having an imperforate lower portion and a perforated upper portion, and a pipe connected with the top of said hood and extending outwardly through said top plate and having a depending perforated end that is inserted Within the perforated upper portion of said cinder can, the perforations in said can and pipe permitting a circulation through said pipe and insuring combustion of the inflammable material therein, substantially as described.

5. A spark arrester, comprising top and bottom plates, said top plate having a discharge opening, and said bottom plate having an opening provided with means for connection with the stack, screens interposed between saidplates one within another and inclosing said opening, a hood supported over the opening in said lower plate and raised out of contact with said plate, a cinder can supported by said plates outside said screens and having an imperforate lower portion and a Wire mesh screen forming its upper portion, a pipe connected to the upper portion of said hood and extending outwardly through said top plate and having a depending perforated end fitting within the screen in the top of said cinder can, and a removable water can arranged within said cinder can below said screen portion, substantially as described.

(3. A spark arrester comprising a bottom plate in the form of an inverted cone having a central opening and means for attachment to a stack, a top plate having a central opening, a screen connecting the peripheries of said top and bottom plates, an intermediate screen depending from said top plate and spaced from said outer screen, the lower edge of said intermediate screen being raised out of contact with said lower plate, a hood inclosed by said intermediate screen and having its lower edge raised out of contact with said lower plate, said hood being substantially cylindrical in form and its upper portion being of substantially the same diameter as the opening in said top plate, and said hood having an imperforate top except for a central opening therein, and a pipe connected with said central opening and extending upwardly and outwardly therefrom, substantially as described and for the purpose specified and a cinder receptacle connected with the outer end of said pipe.

7. A spark arrester comprising a bottom plate having a central opening and means for attachment to a stack, a top plate having a central opening, a screen connecting the peripheries of said top and bottom plates, a hood inclosed by said screen and having its lower edge raised out of contact with said lower plate, said hood being substantially cylindrical in form and its upper portion being of substantially the same diameter as the opening in said top plate, and said hood having an imperforate top except for a central opening therein, and a pipe connected with said central opening and extending upwardly and outwardly therefrom and a screen inclosing the outer end of said pipe.

In witness whereof, I have hereunto set my hand this 3rd day of June 1908.

KENNETH M. COLQUHOUN. WVitnesses:

JNO. A. PITZER, WALTER GRAHAM. 

